i need a honest answer...

[troysidwell]

ok,i have a 1986 20' proline with a Johnson 110 on it..my tag says max HP is 140....
so here is the question...I have a Johnson 150 ready to go,do you think my boat would be ok with that??the weight is about 30 lbs more...like I said,give me your honest answer..i have removed all decals from the 150 engine...

 

[ob]

I come up with a weight difference of around 75 lbs. between a 86' model 110 and a 86' model 150 . Anyway I have no recommendation as to whether you should bolt a 150 on your 20' Proline. The added hp. over the max hp.140 wouldn't concern me as much as the added weight on transom of the V6.

 

[Crosbyman]

insurance companies may not cover it if that is a concern to you

 

[gm280]

I would call your insurance company and get their opinion, but in writing as well. Because I don't see a problem with weight or power. But the spec tag states a max and since you are so close, I would follow the insurance companies recommendation and happy boating. JMHO

 

[just_james]

I agree with on, the added weight could be a issue. What shape is the transom in? And then as Crosbyman said if something happens insurance company Will come after you!

 

[muskyfins]

Local LEO might take issue as well. Where I boat, they make "safety checks" all weekend. They love to write for things many over look like battery terminals covered and if you're exceeding any specs on the vessel. Maybe it sticks in court/maybe it gets thrown out. But they know if they don't generate enough revenue, they'll be out of a job.

But to answer your question............I personally would probably do it.

 

[flyingscott]

Here is a thought instead of overpowering your boat why don't you sell the 2 motors you have and buy a better motor. A 60 deg looper 115 from omc is a great motor and more powerful than your 110 and a lot better on fuel. There is also a yamaha 115/130 that is a great choice and the Merc 125 2+2 is a good choice if you have somebody around you who knows how to work on them

 

[ondarvr]

As for weight, walk to the back of the boat and see what it does, this will be far more weight than the motor, and people frequently put small kickers on their boats that weigh more than 90lbs and have no issues. Most transoms are built about the same from 50HP to 200HP, strength normally isn't an issue.

​Insurance, as long as you tell them what motor you have on it, and they may or may not ask that question, then you're covered and fine. I've asked them the question, they all said as long as they know upfront I was covered, but even when someone didn't tell them the HP they'd never heard of someone not being covered.

​Legality, this is all local, most places don't have a law against overpowering, and since you're at 20' you're not bound by the CG recommendation, if where you live does have a law against it, don't do it.

​And the Coast Guard recommended HP is only that, it's a recommendation, there is no law that can be enforced by them for having more than the recommended HP.

​I'm not saying to do it, or not to do it, just getting the info to you.

 

[StingRay_90V4]

I am by absolutely no means an expert in boats. But like Ondarvr said. Its not the weight at all I would worry about . Or the extra 10 hp really. Our neighbour on our lake has an old 18 ft Doral. It says his max hp rating should be a 90 hp. But he has a 115 hp on it. And a 9.9 hp kicker on it. That's WAY more weight then the original motor alone. And he has had it on for 5 or 6 years sense his old mercury 90 blew up. His 115hp is the Etec. Alot heavier. By almost 100lbs he said. And then the kicker is 50 ish pounds. No problems so far weight wise.

 

[troysidwell]

ok,thats what I was looking for..my transoms is solid,and I also have a kicker motor,well I guess we will see this weekend....thanks guys

 

[jimmbo]

Just curious, what year is the 150?
a 150 is quite a bit bigger than a 110 in physical size. Anyone with the slightest bit of knowledge of outboards will notice that a block away.

 

[ondarvr]

A V6 crossflow is just little taller than a V4, and is small compared to any newer outboard, and if it's legal where he lives it makes no difference.

 

[interalian]

I have 140hp in place of a 90 (both flywheel rated) on a boat rated for 105. I have the 90 hood on the motor, and the original SN and model tag is from the 90. An inspector would have to be plenty savvy to spot any difference.

Now, as for performance, this thing positively screams now, but still feels solid and stable at max, although it exhibits slight porpoising at high speeds - always did with the 90, so it's a hull thing as much as anything.

I was thinking passive trim tabs, or maybe a whale tail on the cav plate would help with the porpoising.

 

[jimmbo]

A V6 crossflow is just little taller than a V4, and is small compared to any newer outboard, and if it's legal where he lives it makes no difference.

The entire engine was larger(midsection and gearcases too), and when introduced in 75 for the 76 model year, if placed next to a V4 there was a very noticeable size difference.

 

[ondarvr]

I had both on my boat, a 90 crossflow and a 200 crossflow, the 200 is small compared to the current line of outboards, so it looks normal, and is only slightly larger than the 90.

​And then it comes down to if it's legal or not where he lives, if it's legal it makes no difference what the physical size of the 150 is, and if it's not, it's still makes no difference because he shouldn't do it.

 

[jimmbo]

I have 140hp in place of a 90 (both flywheel rated) on a boat rated for 105. I have the 90 hood on the motor, and the original SN and model tag is from the 90. An inspector would have to be plenty savvy to spot any difference.

Now, as for performance, this thing positively screams now, but still feels solid and stable at max, although it exhibits slight porpoising at high speeds - always did with the 90, so it's a hull thing as much as anything.

I was thinking passive trim tabs, or maybe a whale tail on the cav plate would help with the porpoising.

It is very hard to tell the differences in HP between any of the 99.6 in blocks, which the 90, 125, 135, 140hp have in common. Some, but not all 85, 100, 115hp also have the 99.6 displacement. Even the smaller blocks(92.6 and 96.3) look the same. the only quick/easy giveaway to a higher HP engine, is the bubble/turtle back exhaust on 135, 140, 110, 112, and prop rated 115s .

Raising the engine height may reduce the porpoising by reducing the leveraging action and reducing bow lift. I know raising the engine can reduce Chinewalking. Prop choice may be a factor too

 

[interalian]

It is very hard to tell the differences in HP between any of the 99.6 in blocks, which the 90, 125, 135, 140hp have in common. Some, but not all 85, 100, 115hp also have the 99.6 displacement. Even the smaller blocks(92.6 and 96.3) look the same. the only quick/easy giveaway to a higher HP engine, is the bubble/turtle back exhaust on 135, 140, 110, 112, and prop rated 115s .

Raising the engine height may reduce the porpoising by reducing the leveraging action and reducing bow lift. I know raising the engine can reduce Chinewalking. Prop choice may be a factor too

I already have the motor up one hole from bottom, and the cav plate is slightly higher than the boat bottom. Would you suggest another hole up even?

And what's this you say about prop choice as a factor - in porpoising?

 

[troysidwell]

i ended up selling that motor and bought a 140,now have to figure what throttle cable.......smh

 

[clemsonfor]

Do that many of you insure your boats?

 

[interalian]

Mine's insured for loss, and liability covered on my homeowner's policy up to $5M.